>Yesterday I pitch raised an old upright over 100 cents. The tone of the >piano went from slightly bright to very dull. I have seen this happen >before on a few unisons or maybe one section but in this case the entire >piano is now very dull sounding. What causes this? The hammers are >grooved, does the pitch change somehow change the string plane or spacing? > >chris Chris, File a hammer or two and find out. If they brighten back up, file the rest. If not, that ain't it. Ron N
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